Buffing-machine.



PATENTED 00w. 1';

J. BUSFIBLD.

BUPFING MACHINE.

APPLICATION FILED Mum. 1904v 2 sanms-snnm. 1,

xx: i go No. 802,136. PATENTED OCT. 17, 1905.

J. BUSFIELD. BUFPING MACHINE.

APPLICATION FILED MAY 25, 1904..

2 SHEETS-SHBET 2.

JAMES BUSFIELD, OF HAVERHILL, MASSACHUSETTS.

BUFFING-MACIHINE.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed May 25, 1904. Serial No. 209,643.

To (LU wltom, it may concern:

Be it known that I, J AMES BUSFIELD, a citizen of the United States,residing at Haverhill, in the county of Essex and State ofMassachusetts, have invented an Improvement in Buffing-Machines, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like numerals on the drawings representinglike parts.

This invention relates to that class of buffing-machines in which thepad of felt or similar material is mounted on a spindle, the axis ofwhich is at right angles to the face of the pad, and a pad-cover with anabrasive outer face is held against the face of the pad. In this type ofbufling-machines it is important that the means for securing thepad-cover to the buiiing-wheel should be such that the cover can bequickly and easily removed, or replaced and also such that said securingmeans is located below the abrasive face of the buffing-wheel.

My present invention has for its object to provide a novel means forsecuring the padcover to the face of the buffing-wheel, which meansembodies the essential requirements above mentioned-that is, it is soconstructed that the cover can be quickly and easily removed from orreplaced upon the wheel and that when in operative position for clampingthe pad-cover in place it is sunk below the face of the pad, andtherefore cannot be brought into engagement with the material beingbuffed.

In the best form of my invention now known to me the means for attachingthe padcover comprises a pad-retainer located within the spindle, saidretainer having at its outer end a clamping-face adapted to cooperatewith a clamping-face carried by the spindle. Suitableautomatically-operative means are employed to separate theclamping-faces and other positively-acting means are employed to drawsaid faces together, thereby to clamp the pad-cover therebetween.

In the drawings, Figure 1 is a view showing my improvements, thebufling-wheel and attaching means for the pad cover being shown insection. Fig. 2 is a View of the bufiing-wheel on the line Fig. 1. Fig.3 is a face view of the pad-cover. Fig. 4 is a section on the line 00 a,Fig. 1. Fig. 5 shows a slightly-different form of my invention. Fig.Fig. 7

6 is a detail hereinafter referred to.

is a view of the face of a buffiing-wheel embodying this form of myinvention.

3 designates the spindle to which the buffing-wheel is applied, saidspindle being shown as mounted in any suitable bearings 4 and as drivenby a driving-pulley 5. The buflingwheel is mounted on the end of thespindle and comprises a back-plate or holder 6, of metal, leather, orany other suitable material, a body portion or pad 7, of felt or similarmaterial, resting against and supported by the holder, and the pad-cover8, which is secured to the face of the wheel and has an abrasive outersurface. The holder and pad are both mounted on the spindle, which isherein shown as being provided with an enlarged end 1 1 to receive them.The pad-cover 8 is held in place by a retaining member which is locatedwithin the spindle and which is provided at its outer end with aclamping head or face adapted to cooperate with a clampingface rigidwith the spindle.

In the form of the invention shown in Figs. 1 and 2 the retaining memberis designated by 9, and the clamping-face thereon is the inner face ofthe head 10 at the end of said retainer, and the clamping-face on thespindle is the bottom of the recess 16, formed in the end of thespindle.

In the form of my invention shown in Figs. 5 to 7 the spindle'has rigidtherewith one or more arms 30, which are shaped to presentclamping-faces 31, and the pad-retainer 9* is shaped at its end topresent arms 32, the inner faces 33 of which constitute clampingfaceswhich cooperate with the clamping-faces 31, carried by the spindle. Iprefer to make the clamping-faces 31 on'the spindle inclined orV-shaped, as best seen in Fig. 6, and therefore the clamping-faces 33 onthe pad-retainer will have a corresponding shape.

In both forms of my invention the retainer is formed at its inner endwith the foot portion 11, which occupies a longitudinal slot 13 in saidspindle, said foot portion being provided with screw-threads 12, withwhich co operate the screw-threads of a nut 15, which surrounds thespindle and lies back of the enlarged portion 1 1 thereof. From Fig. 6it will be seen that the foot portion 11 projects sufliciently beyondthe spindle 3, so that the threads 12 thereof may be engaged by thethreads of the nut 15. Situated within a recess or cavity 18 within thespindle is autoa worn cover with a fresh cover, the nut will be backedoff from the foot portion 11, as seen in Fig. 2, thereby allowing theautomatically-operative means to project the retainer forward, as shownin Fig. 2. When in this position, the pad-cover may be forced over thehead 10 of the retainer and thereafter said retainer forced inwardlyuntil the screw-threaded foot portion is in position to be engaged bythe nut 15. By screwing said nut up the central portion of the pad-coveris. gripped between the clamping-face on the padretainer and that on thespindle, as seen in Fig. 1.

Where the form of retainer shown in Figs. 5 and 6 is employed, thepad-cover is slitted, as at 35, to form apertures through which theclamping ends of the arms 32 may be inserted, the portions 36 of saidpad-cover which are formed by the slits presenting wings which areadapted. to enter between the clampingfaces 31 and 33.

In applying a pad-cover such as shown in Fig. the nut 15 is first backedoff, thereby to allow the automatically-operative means 18 to projectthe retainer into position to have the pad-cover inserted over the headthereof and thereafter the portions 36 of the padcover are firmlyclamped between the-clamping-faces by screwing up the nut 15. It will benoted that in both forms of my invention I provide positively-actingmeans for drawing the clamping-faces together andautomaticallyoperativemeans for projecting the retainer beyond the pad.I regard these two features as quite important, because theautomaticallyoperative means insures that the retainer will be certainlyand automatically projected beyond the faceof the pad as soon as the nut15 is backed off, and the positive means for drawing the clamping-facestogether insures that the pad-cover will be firmly held in place Whilethe machine is in operation. In a bufiingmachine which comprises both ofthese features the pad-cover may be very quickly removed and replaced bya new one, and it is firmly held in place while the machine is inoperation. It will also be noted that in both forms of my invention Ihave so constructed the retaining member that when the clamping-facesare drawn together no part of the retainer projects beyond or even comesflush with the face of the pad. This is a desideratum inbuffing-machines of this class.

The form of clamping means shown in Figs. 5 to 7 has this advantage overthat shown in Figs. 1 and 2, that the pad-cover is gripped gripped onlyat its central portion.

If desired, the pad-retainer shown in Figs. 5 and 7 may be provided witha centering projection 40, adapted to enter a central aperture 451 inthe pad-cover in order to center said cover while it is being applied.

The holder 6 is preferably made adjustable on the spindle-and is held inits adjusted position by a set-screw 27. The advantage in making the.holder adjustable is that it can be moved outward toward the end of thespindle to compensate for any compressing or shrinkage of the pad 7,whereby the face of the pad may always be maintained beyond the end ofthe retainer.

I prefer to provide the backing-piece 6 with a plurality of curvedprongs 4H0, which are adapted to enter the pad 7 and prevent the latterfrom falling off from the spindle when the pad cover is removed. Thesecurved prongs 410 are preferably turned in such a direction that theresistance of the material being buffed against the buifing-wheel tendsto force the same into the pad 7.

The improvements I have above described may be applied in various waysand to any buffing-wheel of this type, whether said wheel is in thenature of an attachment to an ordinary bufiing-machine or constitutes aseparate and independent buffing-machine of itself. In case the deviceis used as an attachment to an ordinary bufiing-machine I propose toform the bearings 42 as part of a suitable casting 30 and which'can beclamped, bolted, or otherwise secured to the side of an ordinary butfer.I may, if desired, provide the spindle 3 with fast and loose pulleys orwith some suitable clutch mechanism, so that it can bestarted andstopped whenever necessary.

While I have illustrated herein two forms of my invention, I do not wishto be limited thereto, as other ways of securing the padcover to thewheel by means of clamping members which are normally located below'thesurface of said wheel, could be used without departing from myinvention.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In a buffing-machine, a spindle having a clamping-face rigidtherewith, a pad-retainer having a clamping-face adapted to cooperatewith that on the spindle, a holder adjustably mounted on the spindle apad borne by the spindle and backed by said holder, a pad-cover, andpositively-acting means to clamp said padcover between saidclamping-faces.

2. In a buffing-machine, a spindle having a clamping-face, apad-retainer having a clamping-face cooperating with that on thespindle, automatically-operative means to separate saidclamping-facesand positively-acting means to draw said faces together.

3. In a bufling-machine, aspindle having a clamping-face, apad-retainerhaving a clamping-face cooperating with that on the spindle,a spring to separate said clamping-faces, and means to draw saidclamping-faces together.

4. In a bufling-machine, a spindle having a clamping-face, a holdermounted thereon, a pad sustained by said holder, a pad-cover, apad-retainer within the spindle and having a clamping-face cooperatingwith that on the spindle. a spring to separate said clampingi'aees, andmeans to draw them together thereby to clamp the pad-cover between them.

5. In abutting-machine, a spindle having a non-axial clamping-face, apad-retainer located within the spindle and having a clamping-facecooperating with that on the spindle.

6. In a bufiing-machine, a spindle having a non-axial clamping-face, apad-retainer located within the spindle and having a clamping-facecooperating with that on the spindle, and means to move said facestoward and from each other.

7. In a buffing-machine, a spindle having at its end a radial armprovided with a clamping-face, a retainer within the spindle also havinga radial arm provided with a clamping-faoe, and means to draw said facestogether.

8. In abufiing-machine, a spindle having at its end a radial armprovided with a non-axial clamping-face, a pad mounted on the spindle, apad-cover, a pad-retainer within the spindle, said retainer having aradial arm provided with a clamping-face to cooperate with that carriedby the spindle, and means to draw said clamping-faces together therebyto clamp a portion of the pad-cover between them.

9. In a buiiing-machine, a spindle provided at its end with a V-shapedclamping-face, a

pad borne by the spindle, a pad-cover, a padretainer having aclamping-face of a contour corresponding to that of the clamping-face onthe spindle, and means to draw said clamping-faces together thereby toclamp a portion of the pad-cover between them.

10. In a buffing-machine, a spindle having a clamping-face, a holdermounted on the spindle, a pad borne by the spindle, a pad-cover,

a pad-retainer located within the spindle and having a clamping-face tocooperate with the clamping-face on the spindle, said retainer having ascrew-threaded portion and a nut on the spindle to engage saidscrew-threaded portion.

11. In a bufiing-machine, a spindle carrying a clampingface, apad-retainer situated axially on the spindle and having a clampingi'acecooperating with that on the spindle, said retainer also having ascrew-threaded portion, a pad, a pad-cover, a nut on the spindlecooperating with the pad-retainer to clamp the pad-cover between saidclamping-faces, and automatically-operative means to separate saidclamping-faces.

12. A pad-cover for a bufling-machine, provided with slits to presentwings, as 36, which.

are situated between the center and the periphery of the cover.

7 13. A pad-cover for a buffing-machine provided with pairs of parallelslits situated between the periphery and center of the cover, each pairof slits being crossed by a transverse slit thereby to presentoppositely-directed wings, as 36.

In testimony whereofIhave signed my name to this specification in thepresence of two subscribing witnesses.

JAMES BUSFIELD.

Witnesses:

LoUIs (J. SMITH, M. A. DUNN.

